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Keep trucking on weak table corruption

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* libguile/hashtab.c (vacuum_weak_hash_table): Don't abort if we
  apparently remove more items than are in the table; instead print a
  warning.  "Fixes" #19180.
This commit is contained in:
Andy Wingo 2016-07-12 09:30:10 +02:00
parent 9c783616cc
commit e1cb762c9a
1 changed files with 14 additions and 2 deletions
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16
libguile/hashtab.c
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@ -134,8 +134,20 @@ vacuum_weak_hash_table (SCM table)
size_t removed;
SCM alist = SCM_SIMPLE_VECTOR_REF (buckets, k);
alist = scm_fixup_weak_alist (alist, &removed);
assert (removed <= len);
len -= removed;
if (removed <= len)
len -= removed;
else
{
/* The move to BDW-GC with Guile 2.0 introduced some bugs
related to weak hash tables, threads, memory usage, and the
alloc lock. We were unable to fix these issues
satisfactorily in 2.0 but have addressed them via a rewrite
in 2.2. If you see this message often, you probably want
to upgrade to 2.2. */
fprintf (stderr, "guile: warning: weak hash table corruption "
"(https://bugs.gnu.org/19180)");
len = 0;
}
SCM_SIMPLE_VECTOR_SET (buckets, k, alist);
}